const [startDate, setStartDate] = useState( moment()); const [endDate, setEndDate] = useState( moment().add(3, 'days')); const disabledDate = (current) => { if (!startDate) { // 如果起始日期未选择,则禁用所有日期 return false; } const maxEndDate = moment(startDate, 'YYYY-MM-DD HH:mm'); return endDate.valueOf() <= startDate.valueOf() || endDate.valueOf() > maxEndDate.valueOf(); }; <Form.Item label="开始日期" name='startTime' rules={[{ required: true, message: '开始日期不能为空' }]}> <DatePicker format="YYYY-MM-DD HH:mm" style={{ width: "100%" }} onChange={(date) => setStartDate(date)} showTime={{ defaultValue: moment('00:00', 'HH:mm') }} /> </Form.Item> <Form.Item label="截止日期" name='expireTime' rules={[{ required: true, message: '截止日期不能为空' }]}> <DatePicker disabledDate={disabledDate} onChange={(date) => setEndDate(date)} format="YYYY-MM-DD HH:mm" style={{ width: "100%" }} showTime={{ defaultValue: moment('00:00', 'HH:mm') }} /> </Form.Item>上面代码有什么问题
时间: 2024-04-21 09:28:30 浏览: 28
这段代码是一个 React 组件中的代码。它定义了两个状态变量 startDate 和 endDate,并将它们分别初始化为当前日期和当前日期加上三天。disabledDate 函数用于禁用截止日期选择器中的某些日期,它会检查当前日期是否在起始日期和起始日期加上一定时间段之间。如果起始日期未选择,函数会返回 false,禁用所有日期。
这段代码中没有明显的问题。但是,根据实际需求,可能需要对日期的选择范围进行更加精细的控制和限制。例如,可以设置最大可选日期、最小可选日期、忽略某些特定日期等等。
相关问题
const j = ['立春', '惊蛰', '清明', '立夏', '芒种', '小暑', '立秋', '白露', '寒露', '立冬', '大雪', '小寒'] const News = () => { const formatDate = (date) => { const year = date.getFullYear() const month = date.getMonth() + 1 const day = date.getDate() const hour = date.getHours() const minute = date.getMinutes() const lunarDate = calendar.solar2lunar(year, month, day) const startDate = new Date(lunarDate.date) const endDate = new Date('2023-05-05'); const diffInTime = startDate - endDate const diffInDays = diffInTime / (1000 * 3600 * 24); return `${year}年${month}月${day}日 ${hour}时${minute}分` } return ( <div> <DatePicker onConfirm={handleConfirm} /> </div> ) } 每年的立春,惊蛰,清明,立夏,芒种,小暑,立秋,白露,寒露,立冬,大雪,小寒,这十二节气的阳历日期都不是固定某一个日期,例如立春,有时是阳历2月4日,有时是阳历2月5日。 使用react、es6语法和Hook修改以上代码,使变量endDate里的固定日期改为与startDate接近的上个月节气、当月节气和下个月节气。
以下是修改后的代码:
```
import React, { useState } from 'react';
import DatePicker from 'react-mobile-datepicker';
import calendar from 'chinese-calendar';
const j = ['立春', '惊蛰', '清明', '立夏', '芒种', '小暑', '立秋', '白露', '寒露', '立冬', '大雪', '小寒'];
const News = () => {
const [endDate, setEndDate] = useState(new Date());
const handleConfirm = (date) => {
const year = date.getFullYear();
const month = date.getMonth() + 1;
const day = date.getDate();
const hour = date.getHours();
const minute = date.getMinutes();
const lunarDate = calendar.solar2lunar(year, month, day);
const lunarMonth = lunarDate.lMonth;
// 获取上个月、当月和下个月的节气
const prevJieQi = j[(lunarMonth + 10) % 12];
const currJieQi = j[lunarMonth % 12];
const nextJieQi = j[(lunarMonth + 2) % 12];
// 计算距离上个月、当月和下个月节气最近的日期
const prevJieQiDate = calendar.getPrevJieQi(year, prevJieQi);
const currJieQiDate = calendar.getThisJieQi(year, currJieQi);
const nextJieQiDate = calendar.getNextJieQi(year, nextJieQi);
// 找到日期最接近的节气
let closestJieQiDate = prevJieQiDate;
let diffInTime = date - prevJieQiDate;
if (nextJieQiDate - date < diffInTime) {
closestJieQiDate = nextJieQiDate;
diffInTime = nextJieQiDate - date;
}
if (currJieQiDate - date < diffInTime) {
closestJieQiDate = currJieQiDate;
}
setEndDate(closestJieQiDate);
}
return (
<div>
<DatePicker
value={endDate}
onConfirm={handleConfirm}
/>
</div>
);
}
```
修改的思路:
1. 使用 `useState` Hook 定义 `endDate` 状态;
2. 在 `handleConfirm` 函数中,先计算当前选择的日期对应的农历日期,并获取当前月份的节气;
3. 然后通过 `calendar` 库提供的方法获取上个月、当月和下个月的节气日期;
4. 最后找到离当前选择日期最接近的节气日期,将其设为新的 `endDate` 值;
5. 在 `DatePicker` 中使用 `value` 属性绑定 `endDate` 状态,并在确认日期时触发 `handleConfirm` 函数。
将这段代码中的ts语法去掉import { useEffect, useState } from 'react'; import moment from 'moment'; export interface ICountdown { deadline: string; format?: 'YYYY-MM-DD HH:mm:ss' | string; } export type Remains = Record<'day' | 'hour' | 'minute' | 'second', number>; const useCountdown = ({ deadline, format = 'YYYY-MM-DD HH:mm:ss', }: ICountdown): Remains => { const [{ current, updater }, setCurrent] = useState({ current: moment(), updater: 0, }); const [remains, setRemains] = useState<Remains>({ day: 0, hour: 0, minute: 0, second: 0, }); useEffect(() => { const timer = window.setInterval(() => { current.isSameOrAfter(moment(deadline, format)) ? clearInterval(timer) : setCurrent(prev => ({ current: prev.current.add(1, 's'), updater: prev.updater + 1, })); }, 1000); return () => clearInterval(timer); }, [deadline]); useEffect(() => { let millisec = moment(deadline, format).valueOf() - current.valueOf(); millisec = millisec >= 0 ? millisec : 0; setRemains({ day: Math.floor(millisec / (1000 * 60 * 60 * 24)), hour: Math.floor((millisec / (1000 * 60 * 60)) % 24), minute: Math.floor((millisec / (1000 * 60)) % 60), second: Math.round((millisec / 1000) % 60), }); }, [updater]); return remains; }; export default useCountdown;
去掉ts语法后的代码如下:
import React, { useEffect, useState } from 'react';
import moment from 'moment';
const useCountdown = ({
deadline,
format = 'YYYY-MM-DD HH:mm:ss',
}) => {
const [current, setCurrent] = useState(moment());
const [updater, setUpdater] = useState(0);
const [remains, setRemains] = useState({
day: 0,
hour: 0,
minute: 0,
second: 0,
});
useEffect(() => {
const timer = window.setInterval(() => {
const newCurrent = current.add(1, 's');
if (newCurrent.isSameOrAfter(moment(deadline, format))) {
clearInterval(timer);
} else {
setCurrent(newCurrent);
setUpdater(prev => prev + 1);
}
}, 1000);
return () => clearInterval(timer);
}, [deadline]);
useEffect(() => {
let millisec = moment(deadline, format).valueOf() - current.valueOf();
millisec = millisec >= 0 ? millisec : 0;
setRemains({
day: Math.floor(millisec / (1000 * 60 * 60 * 24)),
hour: Math.floor((millisec / (1000 * 60 * 60)) % 24),
minute: Math.floor((millisec / (1000 * 60)) % 60),
second: Math.round((millisec / 1000) % 60),
});
}, [updater]);
return remains;
};
export default useCountdown;
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